zero extend 零延拓
Only unmirrored dbspaces and temporary dbspaces can have a non-zero extend size, because chunks cannot be extended in any other type of space.
只有未镜像的 dbspaces 和临时 dbspaces 可以有一个非零 extend size，因为不能在任何其他类型的空间中扩展块。
Extend this process a few times and you can work out that the best choice would be zero.
若将此过程持续几次，你会发现最佳答案应是0。
Extend the platform to allow businesses to push content and messages to customers (even if their prepaid balance is zero) and open call control capabilities focused upon business applications.
扩展该平台，使企业能够将内容和信息发给客户(即使客户的预付费账户余额为零)并打开针对业务应用的呼叫控制功能。
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